import 'dart:math';

import 'package:didvan/models/enums.dart';
import 'package:didvan/models/radar_details_data.dart';
import 'package:didvan/models/requests/radar.dart';
import 'package:didvan/providers/core_provider.dart';
import 'package:didvan/services/network/request.dart';
import 'package:didvan/services/network/request_helper.dart';

class RadarDetailsState extends CoreProvier {
  final List<RadarDetailsData?> radars = [];
  late final int initialIndex;
  late final RadarRequestArgs args;

  int _currentIndex = 0;
  int get currentIndex => _currentIndex;

  RadarDetailsData get currentRadar {
    try {
      return radars[_currentIndex]!;
    } catch (e) {
      return radars[_currentIndex + 1]!;
    }
  }

  Future<void> getRadarDetails(int id, {bool? isForward}) async {
    if (isForward == null) {
      appState = AppState.busy;
    }
    final service = RequestService(RequestHelper.radarDetails(id, args));
    await service.httpGet();
    if (service.isSuccess) {
      final result = service.result;
      RadarDetailsData? prevRadar;
      final radar = RadarDetailsData.fromJson(result['radar']);
      if (args.page == 0) {
        radars.add(radar);
        initialIndex = 0;
        appState = AppState.idle;
        return;
      }

      if (result['prevRadar'].isNotEmpty) {
        prevRadar = RadarDetailsData.fromJson(result['prevRadar']);
      }

      RadarDetailsData? nextRadar;
      if (result['nextRadar'].isNotEmpty) {
        nextRadar = RadarDetailsData.fromJson(result['nextRadar']);
      }
      if (isForward == null) {
        radars.addAll(List.generate(max(radar.order - 2, 0), (index) => null));
        if (prevRadar != null) {
          radars.add(prevRadar);
        }
        radars.add(radar);
        if (nextRadar != null) {
          radars.add(nextRadar);
        }
        _currentIndex = initialIndex = radar.order - 1;
      } else if (isForward) {
        if (!exists(nextRadar) && nextRadar != null) {
          radars.add(nextRadar);
        }
        _currentIndex++;
      } else if (!isForward) {
        if (!exists(prevRadar) && prevRadar != null) {
          radars[_currentIndex - 2] = prevRadar;
        }
        _currentIndex--;
      }
      appState = AppState.idle;
      return;
    }
    if (isForward == null) {
      appState = AppState.failed;
    }
  }

  bool exists(RadarDetailsData? radar) =>
      radars.any((r) => radar != null && r != null && r.id == radar.id);

  void onCommentsChanged(int count) {
    radars.firstWhere((radar) => radar!.id == currentRadar.id)!.comments =
        count;
    notifyListeners();
  }
}